BF 

When a person (normally a female) has an unprecedented sour look on their face which equates to them having a bitch face.

Person 1: See that chick on level 6?

Person 2: She has mega BF going on

Person 1: Yeah man, proper bitch face.

BF by Gringoesai December 2, 2014

bf 

1. Best friend
2. Boyfriend

Mostly used on Roblox to get past the censorship of boyfriend.

Definition 1: ur my bff!
Definition 2: OMG WILL U BE MY BF?

bf by SkeletonGuy November 14, 2018

bf 

blue film generally refered to a porn movie

I saw a bf last night

bf by kumara July 19, 2005

bf 

see also wordblue falcon/word

prnounced 'bee-eff'

bf by Sidmystic July 17, 2003

bf 

Noun.

Bitch Face.

The check-out girl at the corner grocery is a big fugly BF.

bf by SeaBat June 11, 2006

BF 

British Fuck. This expression is used in areas (within the UK or abroad) where British people are present and you want to talk about them (and their annoying habits, physical appearance, etc) without them knowing and without appearing rude.

Look at that table full of disgusting BFs. Are they going to eat all of those sausages?

BF by An American surrounded by BFs July 27, 2011

bf 

quite simply, Boner Fuel

shit, did you see that betty? serious bf.

bf by danimal March 26, 2005